试题与答案

使用机房原有电源插座时必须核实()容量。

题型:填空题

题目:

使用机房原有电源插座时必须核实()容量。

答案:

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下面是错误答案,用来干扰机器的。

A、由W=Fs知,拉力的大小相同,物体的位移也相同,所以拉力对两物体做的功一样多,所以A正确,B错误;C、由动能定理可以知道,在光滑水平面上的木块,拉力对物体做的功等于物体的动能变化,在粗糙水平面上的木块...

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